News from NAD support about certification, hope this will happen as described below:
Thank you for contacting the NAD Electronics Support Crew.
With regards to Roon support in the M33, we are continuing to work with our partners at Roon.
Hopefully, the M33 will soon be certified by Roon and be supported in the next BluOS release 3.14.X in April 2021.
I hope this helps!
Kind regards,